The relationship development could be a slow process. Zuko might have to earn Hakoda's respect. He could do this by showing his skills in combat or his strategic thinking. As they spend more time together, they begin to see each other as individuals rather than just representatives of their respective nations. They might have deep conversations about their pasts, their families, and their hopes for the future, which deepens their bond.
In a 'Zuko meets Toph' fanfiction, they might start off on the wrong foot. Zuko's serious and brooding nature could clash with Toph's brash and independent attitude. Maybe they get into a small fight at first, but then gradually come to respect each other as they realize they both have a strong sense of justice. For example, they could team up to take on a group of bandits that are causing trouble in a village.
In some versions of 'hakoda meets zuko fanfiction', they might meet in a neutral territory. Zuko could be on a mission to find allies for his new vision of the Fire Nation, and Hakoda could be there to negotiate for the safety of his tribe. Their meeting could be filled with tension at first, but then they realize that by joining forces, they can have a greater impact on the future of the Four Nations.
It could be Toph. She's very headstrong and not easily intimidated. Even though Zuko has his own strong personality, Toph would likely push back against any attempts of his to take charge. For instance, if they were in a situation where they had to make a quick decision on which path to take, Toph would probably just start walking in the direction she thought was right without waiting for Zuko's input.
Chapter 13 of the online novel 'Battle Through the Heavens''Meeting Jia Chou Again' described how Xiao Yan and Jia Chou met in the training world and engaged in an intense battle. In this battle, Jia Chou had displayed his great strength and Xiao Yan had also obtained even more training insights during this process.
Iroh 2 might become more empathetic. When he travels to different times, he sees the struggles of people in various situations. For example, if he travels to a time of great famine, he realizes the hardships people face and becomes more understanding.
Perhaps in the fanfic, Ash has achieved a lot in his Pokémon journey, and Misty has also become a more skilled Pokémon trainer. When they meet again, they start to compare their experiences. Ash could show Misty his new and powerful Pokémon, and Misty could introduce Ash to some new training techniques she has learned. And then they decide to train together for a while to improve their skills even more.
Well, it could be that they meet in the afterlife. Maybe they have a heartfelt conversation about their past, like the good times they had in the Underground. They might also talk about their regrets.